Abstract
Degradation of textured :F films in glow-discharge hydrogen plasmas has been minimized by deposition ZnO:Al films onto them. This coating also prevents the diffusion of Sn atoms from :F into the stacked silicon layers of solar cells, while the transmittance and sheet resistivity remain unaltered. Another important aspect is the rear reflection at the back contact. Use of a :Al layer as a back reflector at the /metal interface in a-Si:H tandem solar cells has been found to absorb light of the long-wavelength ( nm) region in the solar spectrum. This improves the short-circuit current density and thereby the efficiency of amorphous silicon solar cells to a great extent.
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